HD DVD wobble detection circuit

Abstract

A circuit including a wobble signal phase imperfection detector configured to detect and correct a phase transition imperfection in a first scaled wobble signal sample. The wobble signal phase imperfection detector includes an integrator configured to integrate the first scaled wobble signal sample over substantially a half-period portion of the wobble clock signal, and a selector configured to select as an output either i) the first scaled wobble signal sample integrated over substantially one period of the wobble clock signal or ii) the first scaled wobble signal sample integrated over substantially the half-period portion of the wobble clock signal, wherein selection of the first scaled wobble signal sample integrated over substantially one period of the wobble clock signal indicates that the phase transition imperfection does not exist with the first scaled wobble signal sample.

What is claimed is: 
     
       1. A circuit comprising:
 an analog to digital converter configured to generate a first wobble signal sample based on a wobble clock signal, wherein the wobble clock signal is generated based on a wobble of an optical disc; 
 a multiplier configured to scale the first wobble signal sample to generate a first scaled wobble signal sample; 
 an integrator configured to integrate the first scaled wobble signal sample over one period of the wobble clock signal; and 
 a wobble signal phase imperfection detector configured to detect and correct a phase transition imperfection in the first scaled wobble signal sample, wherein the wobble signal phase imperfection detector comprises
 an integrator configured to integrate the first scaled wobble signal sample over substantially a half-period portion of the wobble clock signal, and 
 a selector configured to select as an output either i) the first scaled wobble signal sample integrated over substantially one period of the wobble clock signal or ii) the first scaled wobble signal sample integrated over substantially the half-period portion of the wobble clock signal, 
 wherein selection of the first scaled wobble signal sample integrated over substantially one period of the wobble clock signal indicates that the phase transition imperfection does not exist with the first scaled wobble signal sample. 
 
 
     
     
       2. The circuit of  claim 1 , further comprising:
 a decoder, 
 wherein in response selection of the first scaled wobble signal sample integrated over substantially the half-period portion of the wobble clock signal, the detector is configured to
 decode the first scaled wobble signal sample integrated over substantially the half-period portion of the wobble clock signal to obtain wobble address period data. 
 
 
     
     
       3. The circuit of  claim 1 , wherein the optical disc comprises a video disc recording media employing Binary Phase Shift Keying (BPSK). 
     
     
       4. The circuit of  claim 3 , wherein the optical disc comprises a DVD, an HD DVD, a DVD+R, or a DVD+RW. 
     
     
       5. The circuit of  claim 1 , wherein the half-period portion of the wobble clock signal is i) a first half period portion of the wobble clock signal or a second half period portion of the wobble clock signal. 
     
     
       6. A system comprising the circuit of  claim 1 . 
     
     
       7. The system of  claim 6 , wherein the system comprises a recording drive. 
     
     
       8. The system of  claim 7 , wherein the recording drive comprises a spindle motor drive configured to spin the optical disc. 
     
     
       9. A method comprising:
 generating a first wobble signal sample based on a wobble clock signal, wherein the wobble clock signal is generated based on a wobble of an optical disc; 
 scaling the first wobble signal sample to generate a first scaled wobble signal sample; 
 integrating the first scaled wobble signal sample over one period of the wobble clock signal; and 
 detecting and correcting a phase transition imperfection in the first scaled wobble signal sample, including
 integrating the first scaled wobble signal sample over substantially a half-period portion of the wobble clock signal, and 
 selecting as an output either i) the first scaled wobble signal sample integrated over substantially one period of the wobble clock signal or ii) the first scaled wobble signal sample integrated over substantially the half-period portion of the wobble clock signal, 
 wherein selection of the first scaled wobble signal sample integrated over substantially one period of the wobble clock signal indicates that the phase transition imperfection does not exist with the first scaled wobble signal sample. 
 
 
     
     
       10. The method of  claim 9 , wherein the method further comprises:
 in response selection of the first scaled wobble signal sample integrated over substantially the half-period portion of the wobble clock signal, decoding the first scaled wobble signal sample integrated over substantially the half-period portion of the wobble clock signal to obtain wobble address period data. 
 
     
     
       11. The method of  claim 9 , wherein the optical disc comprises a video disc recording media employing Binary Phase Shift Keying (BPSK). 
     
     
       12. The method of  claim 11 , wherein the optical disc comprises a DVD, an HD DVD, a DVD+R, or a DVD+RW. 
     
     
       13. The method of  claim 9 , wherein the half-period portion of the wobble clock signal is i) a first half period portion of the wobble clock signal or ii) a second half period portion of the wobble clock signal.